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--- wiki:astronomy:coordinate_systems [2023/11/11 19:11] – created Roy Prouty
+++ wiki:astronomy:coordinate_systems [2023/11/11 19:42] (current) – Roy Prouty
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 ===== Angles on the Sky =====
+Primer on [[~spherical|Spherical Coordinates]].
+==== Horizontal Coordinate System ====
 Discuss Altitude and Azimuth, discuss poles, fundamental plane.
 Discuss issues with this system for astro purposes.
+==== Equatorial Coordinate System ====
+Discuss degrees of arc, arc mins, arc secs.
+Discuss hours or arc, minutes or arc, seconds of arc.
+Since a complete circle contains 24h of right ascension or 360° (degrees of arc), 1/24 of a circle is measured as 1h of right ascension, or 15°; 1/1440
+of a circle is measured as 1m of right ascension, or 15 minutes of arc (also written as 15′); and  1/86400 of a circle contains 1s of right ascension, or 15 seconds of arc (also written as 15″). A full circle, measured in right-ascension units, contains 24 × 60 × 60 = 86400s, or 24 × 60 = 1440m, or 24h. -- from wikipedia on RA
+Discuss Celestial Sphere. Discuss RA units, discuss DEC units,  discuss poles, fundamental plane.
+Discuss Hour Angle.
+Discuss how to determine an object's alt/az based on RA/DEC/Time/Lat/Lon.
+==== Ecliptic Coordinate System ====
+Nah
+{{tag>[math coordinates not-done]}}